There are four channels for finding automation retrofit solutions for machinery (based on industry practice): ① Original Equipment Manufacturers (OEMs) (retrofit services provided by the brand, e.g., Bosch Rexroth or Siemens modernization); ② System Integrators (PLC, robotics, and production line integration); ③ Third-party Retrofitters (specializing in upgrading legacy equipment); and ④ Online Platforms (industrial control networks or industry directories)—focusing on adding automation capabilities without replacing the entire machine.
I.
OEM Retrofitting
Brand Providers: Bosch Rexroth modernization (extending service life; Source: Bosch Rexroth); Siemens Migration: Migrating legacy equipment to new automation technologies (Source: CNC Design); Upgrade Kits: Standardized components and upgrade kits (Source: Bosch Rexroth China); Advantages: OEM compatibility and warranty coverage; Disadvantages: High cost and long lead times—OEM retrofitting: The most reliable but most expensive option (suitable for critical equipment).
II.
System Integrators
Services: Control system development, on-site installation, and energy management (Source: Yongmao Systems); Production Line Integration: One-stop service from solution consulting to installation and commissioning (Source: Tianqi); Brand Coverage: Multi-platform support including Rockwell, Siemens, ABB, and Mitsubishi (Source: Applied Motion); Global Delivery: Planning → Programming → Installation → Commissioning (Source: Blumenbecker); Advantages: Non-standard customization and cross-brand capabilities—Integrators: Flexible, though vendor selection requires evaluating past case studies.
III. Third-Party Retrofitters
Positioning: Specialized in upgrading legacy equipment (without replacing the entire machine); Services: PLC/MCU/HMI software integration + fixture/test station optimization; Levels: Basic (replacing motor drives) → Comprehensive (replacing the entire control system); Safety Compliance: CE safety compliance post-retrofit; Advantages: Cost-effective and fast—third-party providers offer high value for money (suitable for standard equipment).
IV.
Platform-Based Search
China Industrial Control Network (gongkong): Directory of industrial PCs and service providers; Industry Directories: Supplier listings on B2B platforms (e.g., b2b168); International: Integrator directories (e.g., integratorindia); Trade Shows: Industrial expos/automation fairs (on-site comparison); Reputation: Peer recommendations + case study verification—Platform search strategy: Create a shortlist (5–8 companies) before comparing.
V.
Selection and Evaluation
1. Case Studies (experience with similar equipment retrofits); 2. Engineers (PLC/robotics skills); 3. Platform/Partnerships (authorization from mainstream brands); 4. Services (post-retrofit warranty/training); 5. Timeline (scheduling downtime windows)—Five key evaluation criteria: Cases/Technology/Authorization/Service/Timeline (retrofitting is a systems engineering task).
VI.
Retrofit Process
Assessment: On-site evaluation + proposal and quotation; Design: Electrical schematics + programming strategy; Implementation: Retrofit during downtime (scheduled window); Commissioning: No-load test → Load test → Trial production; Training: Operation and maintenance handover—Process flow: Assessment → Design → Implementation → Commissioning → Training (evaluate value before proceeding).
7. When to Retrofit
Reasons include: obsolete equipment with hard-to-source spare parts (outdated control systems); subpar precision or efficiency (performance-enhancing retrofits); digital integration needs (data acquisition/remote monitoring); safety upgrades (compliance with guarding/emergency stop standards); and capacity expansion (increasing output).
Regarding automation retrofits for machinery: OEMs offer the most stability, system integrators provide flexibility, and third-party providers offer cost-effectiveness (assess first, then select the solution; retrofitting saves 30–50% compared to buying new equipment).
